Development And Test Of Hybrid Control Unit

With two challenges of energy sources shortage and environment Pollution to global vehicle industry, new energy vehicle should be researched right now. Compared to traditional ICE vehicle, hybrid electric vehicle has not only characters of ICE vehicle, but also advantages of electric vehicle, and HEV has much been perspective to improve fuel economics and reduce emission. At present, HEV has been developed much widely in Japan, Europe and American, and in China HEV also has been developed very a pace.As HEV needs engine, motor and battery to work harmoniously, all the components often change their work mode under the control strategy, all these require a more rigorous condition in the hardware and software for the Vehicle Control System. Hibrid Control Unit (HCU) is the core control component of HEV. It can calculate parameters required such as engine output power&motor and generator torque ete. By the input signals such as driver attempts, accelerate pedal position, gear and brake pedal position and the State of Charge(SOC) of battery. So, it can make the power components cooperate and ensure the HEV to run normally. Besides, it can reach to the high efficiency by running charging and braking regeneration etc. Therefore, the design of HCU will directly influence the power, fuel economy, reliability and other performances.A pattern of control unit was designed for a parallel hybrid electric bus according to the characteristic and work principle of MCU and the method of electro-magnetic compatibility design. According to hardware design plan, hardware design was mainly divided intoMC9S12XDT512least system design, A/D conversion circuit design, D/A conversion circuit design, RS232serial communication circuit design, I/O interface circuit design, power design and CAN communication circuit design. MC9S12XDT512least system included reset circuit design and clock circuit design and so on.The hardware design was completed, the controller hardware based on the logic theory for HCU was prepared.In the end of the article, the performance of the system was testified by hardware-in-the loop simulations. The simulation results showed that the HCU system worked in a stability condition. It was reliable and can meet the commands of the vehicle control function.